<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css 样式</title>
    <style>
        #login{
            color:green;
            background-color: brown;
        }
    </style>
<link 
</head>
<body>
    <span style="color: white;background-color: blue;">道路千万条</span>
    <hr>
    <span id="login">登录</span> 
    <span id="lg">登录</span> 
</body>
</html>